懒人写法

#include<bits/stdc++.h>
using namespace std;
int main(){
	long long t,m,a,b,c,x,ans1,ans2;
	cin>>t>>m;
	while(t--){
		cin>>a>>b>>c;
		x=b*b-4*a*c;
		if(x<0){
			cout<<"NO"<<endl;
			continue;
		}
		ans1=(0-b+sqrt(x))/(2*a);
		ans2=(0-b-sqrt(x))/(2*a);
		cout<<max(ans1,ans2)<<endl;
	}
}